As always, filter my advice through an experience filter. I'm not that experienced and far from an expert, but I've been playing--and winning--a lot of $10 SNGs on Party, which is a challenge in and of itself.

First, there aren't 6 or 7 tight aggressive players in any $10 SNG, at least on PP. There are more and more games where the blinds are at levels 4 and 5 and there are 7 or 8 players left. They are playing more tight, but not necesarily tight/aggro. Most often, they are tight/weak. Tight, aggressive players are usually pretty good, and there are rarely more than one or two in any SNG, and depending on luck early, one of them might already be gone to a coin flip by the time it gets to 5 left. The rest are calling stations, at best, or had early luck. You need to identify the players based on what hole cards they play, how they play post-flop, and what they call with to the river.

If they play any two suited, they aren't T/A. If they check or call more than they raise, they aren't T/A. If you see a hand with A high or a medium pair win the pot and they muck, they aren't T/A. They can be beaten quite handily, if you are the better player.

Blind stealing works best when it's down to 5, and hardly at all when it's still 7 or 8. One of the bunch is going to have a hand. They don't understand position. You do. So, when you are late, button or CO with a tight/weak to your left, then you can get the blinds, if it is checked around to you. If someone calls, you probably can't get them to fold. Semi-bluffs work better. If you are called, then you can play the hand. Pure bluffs are better post-flop, if you play post-flop better than your opponents.

Finally, I rarely if ever go all-in, unless I'm absolutely sure I've got the best hand. I try hard to never call an all-in. If I'm going all-in, I want to be the one who's pushing, not being pushed. As long as I have them covered, I have to have the confidence I can come back from a loss to go in with all my chips.

Hope there's something here you can use.